Re: [wsrp] Event distribution question

[Rich Thompson <richt2@us.ibm.com>]

Especially considering that it is always
a Consumer choice as to whether to dispatch an event at all, I would not
consider the proposed Consumer behavior to violate the conformance statement.
For me, the key is that the Consumer has finished dispatching events for
the request cycle in which it is  gathering markup from the single
portlet.

Rich

Subbu Allamaraju <subbu@bea.com>

01/31/06 04:52 PM

To	OASIS WSRP TC <wsrp@lists.oasis-open.org>
cc
Subject	[wsrp] Event distribution question

Under the section that describes the "Three-step
Protocol" (sorry - no 
page numbers again), there is a conformance statement requiring that 
consumers MUST NOT begin gathering the markup until it considers that 
all portlets to have finished the event distribution step.

I remember the background on this statement, but need some clarification
on how to interpret this in the context of a specific implementation 
scenario.

Here is my use case:

- Consumer is rendering a portlet in a different browser request, either
by using an iframe, or through some DOM manipulation via Ajax.

- Portlet has an action URL.

- Portlet fires an event during this action processing. This event can
only be handled by some other portlet.

- Consumer looks at the events, but since it is not rendering other 
portlets during the same user request, decides to batch the event for a
future delivery. When the user requests the aggregated page sometime 
later or when the target portlet is being rendered via another request,
the consumer decides to dispatch the batched event to that portlet, and
render those.

This flow also ties into the use cases I brought up for using Ajax in 
portlets. I can hear arguments that this opens up state management 
issues, but I would argue that this is a consumer's issue and the spec
should not care whether the aggregation is done in the same request or
across several requests.

I can see two possible interpretations of the statement, one of which 
makes the above scenario not comply to the spec.

1. Consumer considers that there is only one portlet being processed in
the current request, and decides that event distribution is over. Here
"all" implies just one portlet, and hence is complying to the
spec.

2. Consumer is rendering a portlet before dispatching the event, and 
hence is violating this conformance statement.

What do others think?

Regards,
Subbu

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